Detect the required mod loader and install it

[osfanbuff63]

Currently, for a Fabric modpack (say, Fabulously Optimized) you have to download and install Fabric manually, otherwise the modpack doesn't work. ~~This seems like something Modrinth either has or should have an API route for (but I asked here (via) anyway).~~ EDIT: You can get it by fetching all the versions of a given project or its search result, the latter not being recommended, which based on the app's function itself, you already do.

[Gaming32]

Modpacks actually contain this information. However, loader installation is specific to the launcher. I guess I could support the Vanilla launcher specifically for this purpose.